rustdoc: use browser-native tooltips for code and notable hover #111856
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This is the simplest way to adopt the timing guidelines described in https://www.nngroup.com/articles/timing-exposing-content/. It replaces the mouseover interactions used for "tooltip" popovers with HTML
title
attributes, which already do the right thing.The JavaScript-based popover code remains for click interaction, so that these elements remain accessible on touch screens, and because it's not possible to put links in native tooltips.
Preview
On-hover tooltip for notable traits
On-click popup tip for notable traits (unchanged)